Effect of Grewia optiva and Populus deltoides leachates on field crops

摘要

The tree releases the chemical substances (allelochemicals) in the soil. Besides, water soluble allelochemicals from the live trees are also released in rainwater, dew and mist as leachates. These leachates may inhibit or promote the germination, growth and yield of receiver plants and this phenomenon is called allelopathy. However, according to new definition, Allelopathy refers to any process involving secondary metabolites produced by plants,. microorganism, viruses, fungi. that influence the growth and development of Agricultural-and Biological systems. Allelochemicals. play a major role in the basic metabolism of the plants and affect numerous physiological and biochemical processes in the plants (12). Allelopathy in crop production is related to soil sickness, autotoxicity, yield decline, pre-disposition of plants to diseases, reduced nitrification, nutrient uptake, and weed interference with crops.. (9). However, the effects of these chemicals on other plants are concentration dependent and also influences by other compounds present in the leachates.